In recent years, interest in weapon system supportability has grown tremendously. Coupled with is a complementary emphasis on life cycle cost analysis. Both arise from a concern that weapon system ownership costs are extraordinarily high and that improved understanding of supportability issues and their effect on life cycle costs can result not only in dollar savings, but also in increased system readiness and capability. These considerations led to development of a methodology for comparing ownership costs and supportability that enables Program Managers to more easily evaluate design tradeoffs. The methodology involves use of a modified life cycle cost model that yields as outputs both relative cost and supportability, where operational availability acts as a measureable surrogate for supportability. The modified model uses the DOD's CAIG approved cost element structures in an attempt to use cost/ availability output in support of Defense Systems Acquisition Review Council (DSARC) milestones. The methodology is applied to a sample data base from the HH-60D program.